Outdoor ad and shoe polish device

This device is an elevated seat employed by shoe polisher in Puebla, Mexico (Seen last month there). What is strikingly intriguing on this picture is that it has been used as an outdoor advertisement space.

Why do I blog this? this draws some good reflection about spatial features in cities and cultural differences (nothing like this can be seen down there in Switzerland ;). To what extent an urban artifact begins to have secondary affordances like this? Would it be interesting to use it as a receptacle for other types of information?